In order for TNSR to control network interfaces, they must be disabled in the
host OS. In most cases this is not necessary, as network interfaces not
configured in the installer will be automatically disabled in CentOS during the
installation process. For a fresh installation of TNSR, skip ahead to
Setup NICs in Dataplane. This section remains to explain how to change interfaces
added after initial installation, or for installations which do not contain
whitelisted network interfaces.

This is a two-step process. First, the link must be forced down, and
then the network interface must be disabled in Network Manager.

Warning

The host management interface must remain under the control of the
host operating system. It must not be configured as an interface to be
controlled by TNSR. Do not disable the management interface during this step.

For each of the interfaces noted in the last section, manually force the link
down:

$ sudo ip link set <interface name> down

For example:

$ sudo ip link set enp0s20f1 down
$ sudo ip link set enp0s20f2 down

Next, disable these network interfaces in Network Manager. For each of these
interfaces, edit the corresponding startup script:

$ sudo vi /etc/sysconfig/network-scripts/ifcfg-<interface name>

In each of these files, ensure the following values are set. Add lines if they
are not already present in the file: